Lifting-jack.



PATENTED JUNE 27, 1905.

N. WEILER.

LIFTING JACK.

APPLICATION FILED SEPT. 9, 1904.

8 S ETS-SHEET 1.

v v v w/rNfssEs.-

v1 E N M n A PATENTED JUNE 27, 1905.

N. WEILER.

LIFTING JACK.

APPLICATION FILED SEPT. 9. 1904,

I C V v v V v,

3 SBTS-EHEET 2.

AA vvvv INVENTO/"r` W/TNESSES:

TTOHNEY PATENTED JUNE 27, 1905.

3 SHEETS-SHEET 3.

INVENTOH N. WEILER.

LIFTING JACK.

APPLIOATION FILED SBPT.Q.1904.

W/TNESSES:

vI F N m n A ivo. 793,16*?.

Patented June e7, 1905.

UNITED STATES PATENT OEEICE.

NICK IVEILER, OF SIOUX CITY, IOIVA.

LlFTlNG-JACK..

SPECIFICATION forming part of Letters Patent No. 793,167, dated June 27, 1905.

Application filed September 9,1904. Serial No. 223,917.

To all whom, it 71mg/ coli/cern:

Be it known that I, NICK IVEILER, a citizen of the United States, residing at Sioux City, in the county of lVoodbury and State of Iowa` have invented a new and useful Improvement in- Lifting-Jacks; and I do declare the following to be a full, clear, and exact description of the same, so as to enable others skilled in the art to which it appertains to make and use said invention, reference being had to the accompanying' drawings, forming a part thereof.

My invention relates to lifting-jacks, and particularly to that kind which raises or lowers the load by a step-by-step movement, the mechanism being operated `in one direction to raise the load, while means are provided to reverse the movement when the load is lowered.

The invention consists in the novelty of construction, arrangement, and combination of the various elements, as will be pointed out in the claims.

I have fully illustrated my invention in the accompanying drawings, in which-- Figure 1 is a view in side elevation, the mechanism being adjusted to raise the load, a portion of the frame being broken away to show the operation of the parts, the dotted lines showing the different positions which the parts assume. Fig. 2 is a like view illustrating the position of the parts when lowering the load. Fig. 3 is a view in front elevation. Fig. 4 is a front view of the upper part of jack with the operating levers and bars re- Inoved. F ig. is a plan view of jack, andllig'. 6 is a detail view of section of pawl-carriag'e and pawl.

My invention consists in general of a Vframe inclosing a bar having teeth on one side, levers pivotally connected with the frame, pawls operated by springs and supported in pawlcarriages which are pivoted at one end in the frame and operated by the levers, and an adjustable bar attached to the frame for reversing the movement of the pawls.

Like parts are designated by similar letters of reference throughout the several views.

A designates the base of the frame, B the frame or general body of the jack, while A' A/ designate braces supporting the frame and formed with the frame and base.

C is the upright movable bar, racked or toothed on its front face, the inside of the Vframe forming a suitable passage or guide way for the bar. whose top C/ is broadened to receive the weights to be lifted. A foot or projection C/ is formed near its lower end to receive the weights which are too low to be engaged by the top. i

D D are pawl-carriages the sides of which are connected by the shelves F, on which rest the inner ends of the pawls E, the inner ends 4of the carriages being fulcrunied to the sides of the frame by the bolts d. At the outer ends of the pawl-carriag'es are rollers G, pivotally situated on the axes y, which also connect the opposite sides of the pawl-carriages. The rollers extend below the sides of the carriages and rest upon the fulcrumed levers presently described. The pawls are situated between the sides of their respective carriages, the outer ends e being' reduced and rounded and adapted to rest in annular openings in the outer ends of the carriages. The inner ends are somewhat enlarged and each have three teeth e for engagement with the racked bar C. Near the central part of each pawl the bottom portion is recessed or cut out, and the pawl between the recessed part and the outer end is annularly cored for the reception of a bolt c. A coil-spring l; encircles the rounded part of the pawl, resting between the outer end of the carriage and the shoulder of the pawl formed by the reduction of the rounded part. 'lhe pawls being forced into engagement with the racked bar by the normal pressure of the springs c upon the inner surfaces of the outer ends of the carriages, when a reciprocating Inovernentis imparted to the operating-levers the pawl-carriages and pawls are alternately elevated, pushing the rack upward. When it is desired to lower the load, the operation of the pawls is reversed by the action of the springs j', coiled about the bolts c, extending from the recessed parts of the pawls through the cores to the outer ends. Each of the springs f rests between the side of the eut-out part and a nut c' on the inner or free ends of the bolts, which are always free from contact with the side of the cut-out part. The springs f a-re inoperative eXcept during the reversing process and are of shorter diameter and stronger than the springs e.

The following means are provided for the operation of the pawls: The operating-lever H, having a handle H', is fulcrumed to the frame of the jack by the bolt L, the inner end of the lever havinga cam projection HQupon which rests the roller of the upper pawl-carriage. The curved lever J is fulcrumed to the frame-underneath thelower pawl-carriage by means of the bolt j, the said lever curving; upwardly at the inner end, upon which the roller of the carriage rests, which givesk the lever an eccentric movement, with referenceV to the roller. The outer end ofthe lever lis pivotal'ly connected withthe lower` end` of ai vertical bar I by the bolt. 72 and said. bar at its upper end is pivotally connected to the operating-bar H' at about midway the length of Said:` bar by the bolt f., When the handlerof` the operating-lever is lowered tothe position.. indicated by the dottedy lines in Fig, l,` the thick` partA of the cam is brought under the roller of the upper carriage,.thus elevating. the carriage and pawl, and. the pawl being heldv in engagement with the rack by the spring e the rack isforced upward. At: the same time the inner.y end of the lever. J= is broughtl under the roller of the lower. car.- riage, permitting this carriage to drop-down, freeing the lower pawlof the load` and allowing it to pass the teeth of the rack. the handle of the lever is raised,A the narrow part of the cam is under the upper roller-permitting the upper-carriage tol drop-and the upper pawl to passthe teeth of the raclLwhile the curve of the lever J' is brought underthe lower.4 roller, thuselevating the lower carriageV and pawl and in turn raising the rack, the

springe inthe lower pawl holding'this pawl.

in engagement. Thus the reciprocating movement of the operating-lever alternately raises and lowers thepawl-carriages and causes the pawls to elevate the rack by alternately engaging its teeth.

Then .it is desired-to reverse the action of the pawls, the following meansare utilized: A; narrow vertical. bar K, having triangular projections his secured to the leftside ofthel frontface of the frame by means ofithebolts` c, a thin plate K.' separating the bar from.

the face. ofthe frame. rllhe bolts 7s freely, enter the slots Z and Zin the bar. K and permit a. limited vertical movement of the bar. The upper slot Zv being of irregular.shape,.the bar is retained in. its raised positionbyadjustmentof the slot to the upper bolt. Horizontal bars b, secured atone end to the bolts @,keXtend at rightangles to `the bar K, and the triangular-shaped heads attached to the bars Zaai-ey adapted to come in contact with WhenV the handle of the lever and rest upon the triangular projections 76 when the vertical bar is raised. Itis evident that if the pawls are alternately thrown out- Wardl at each stroke of the operating-lever the toothed rack is lowered instead of raised by the same process. To insure this movement, the pawls must be held from engagement with the rack. until. they pass the teeth and then Aforced into engagement therewith. After the bar K is raised and secured in the position shown in Fig. 2 the bar-heads I) are each alternately in contact with the inclined faces of the projections 1c, and when the pawls are released by theaction of the leversand the carriages drop-V down their weight rests upon said projections, which causes the bar-heads -ito slide along their. inclined faces and forces outward the bolts c, compressing tliespnings la, while thepressure of the springs'f over comes that ofy the springs-@and directs the pawls outward-f,4 holding. themf fromr engage-- ment.v henl the pawlicarriages are-again: raised: and the bar heads aref-reed of' theV weight ontV the inclined: projections ofthe-ventizf cal barthe springs f are released. 'llhespringsl e relaxV and at theA proper moment. direct the pawls intoengagement.` It. will. thus-be seen: that the elevation of.' the'ver-ticalba-r Kbnings intoA operation-the normally passive spr-ingsf and completely reverses the action. ot theV paw/lsf.

Therings zare secured tothe-cuten ends-ofl the bolts-c in order thatthepawls mayfbeadv' justed with the fingers should it ever becomel necessary.` When: itgis-desired to=lower. the load all-at once, it mayv bedone when-the bar.l K- is raised `andtbothpawls'arefinz engagement by first turning the ring a in the lower pawl: and tighteningV thesprings' f, then, with:V the fingers releasingthe upperpawland lowering. 1t will. be seen that. the ratchetor. cog; movement hereshownfr maybe applied w-ithequal-v facility to an circular` ork ratchet wheel and. ist not, limited tol anyl particular device.

Having described my invention,v whatV I. claim .as new, and-desire; to v-secure14V by Letters Patent, is

l. The combination of.; an `upright movabley bar having, teethonl oneside thereof,` aframe forming. a .guide or passageway forl said bar, ypawl-carriagesfulcrumed to saidy frame, rollf 1ers supported on axes underneath said-.car-

IOO

veais? ends to said frame one above the other, rollers underneath said carriages on which the weight of the carriages is adapted to rest, pawls movable in each of said carriages adapted for engagement with said bar, springs in said carriages to normally hold said pawls in engagement, a lever fulcrumed to said frame beneath the upper carriage, a cam projection on said lever on which the roller of the upper carriage is adapted to rest, a curved lever 'tulcrumed beneath the lower carriage on which the roller of said carriage is adapted to rest, and a bar pivotally connecting the outer end ot' said curved lever with said tirst lever, substantially as described.

3. The combination with an upright movable bar having teeth on one side thereof, a frame supporting said bar, of pawl-carriages fulcrumed to said frame, rollers on which said carriages are adapted to rest, pawls movable in said carriages and adapted for engag'ement with said bar, springs in said carriages for normally holding said pawls in engagement, and means applied to said rollers for alternately elevating said carriages and pawls whereby said bar'is raised, substantially as described.

a. The combination with a frame, an upright movable bar having teeth on one side thereof, of pawl-carriages'fulcrumed to the frame, rollers in said carriages on which the carriages are adapted to rest, pawls E supported in said carriag'es and adapted for engagement with said bar, springs e for holding said pawls in engagement, and levers t'ulcrumed to the Jframe and applied to the rollers for alternately elevating said carriages and pawls, substantially as speciied.

5. The combination of an upright movable bar having teeth on one side thereof, a vframe supporting' said bar, two pawl-carriages D the inner ends of which are fulcrumed to the frame one above the other, rollers in said carriages on which the carriages are adapted to rest, pawls E supported in said carriages and adapted for engagement with said bar, springs e to normally hold said pawls in engagement, levers H and J tulcrumed to the frame underneath said carriages and pivotally connected by the bar l, and a cam projection H" on the end of said lever H, substantially as described.

6. The combination of an upright movable bar having teeth on one side thereot', a trame supportingsaid bar, pawl-carriages Afulcrumed to said frame, rollers underneath said carriages, pawls movable in said carriages and adapted for engagement with said bar, springs for normally holding said pawls in eng'agement, levers fulcrumed to said frame and adapted to be applied to said rollers for alternately elevating said carriages and pawls, and means Jfor overcoming the pressure of said springs and alternately throwing said pawls outward at each stroke of said levers and holding said pawls from engagement while the bar passes the teeth ot' said pawls, substantially as described.

7. The combination of a frame, an upright movable bar having teeth on one side thereof, pawl-carriages fulcrumed to said frame, rollers underneath said carriages, pawls movable in said carriages and adapted to engage said bar, said pawls being recessed on one side and cored from the recessed parts to the outer ends, springs for normally holding' said pawls in engagement with said bar, bolts extending through said cores t'rom the recessed parts ot' said pawls to the outer ends thereotl and having nuts on the inner or free ends, coil-springs on the inner ends ot' said bolts between said nuts and the opposite sides ot' said recessed parts, said springs being stronger than the inst-mentioned springs, levers vt'ulcrumed to the frame and adapted to be applied to said rollers for alternately elevating said carriages and pawls, and means for withdrawing the bolts in said pawls and compressing the coilsprings therein as said carriages descend, substantially as specilied.

8. The combination of a frame, an upright movable bar having' teeth on one side thereof, pawl-carriages fulcrumed to the frame, rollers underneath said carriages supporting the same, pawls movable in said carriages and adapted to engage said bar, said pawls being recessed on one side and cored from the recessed parts to the outer ends, springs tonermally hold said pawls in engagement, bolts extending through said cores `from the 1'eeessed parts to the outer ends ot' said pawls and having nuts on the` inner or tree ends thereof, coil-springs on the inner ends ot' said bolts between said nuts and the opposite sides of said recessed parts, said springs being' stronger than said first-mentioned springs, levers fulcrumed to the frame and adapted to be applied to said rollers for alternately clevating said pa\\'l-carriages and pawls, horizontal bars secured at one end to the outer ends of said bolts and extending at right angles therefrom, heads secured to the free ends of said bars having' inclined laces on the under surface thereof, a vertical bar movably secured to the frame and having' inclined projections thereon on which the inclined faces of said horizontal bars are adapted to rest, means for raising and securing said vertical bar so that the weight ot' said carriages rests on said projections when the carriages descend, substantially as described.

9. The combination ot' a traine, an upright movable bar having teeth on one side thereof, pawl-carriages l) fulerumed to said frame, pawls E supported in said carriages and adapted to engage said bar, springs e for normally holding said pawls in engagement, bolts c extending through the cores ot' said pawls, springs f on the inner or free ends ot' said bolts, rings a secured to the outer ends of said bolts, bars b secured at one end to said bolts IOO IIO

fulcrumed to the frame of the jack,` rollei'sfon which said carriages are adapted to rest`1 paWls E supported in saidcarriages, springs-'for normally holding saidwpawls in engagement,-

bolts 0 extending through-said pawls'and coilsprings f situated thereon, means for overcoming the pressure of -said springs and alternately throwing said paWls outward andhold? ing: them from engagement, and--leversful` v mais? `crumed to the-frame andadapted to be applied "to said rollers for" alternately-elevatingsaid l carriages Aand paWls','substant-iallyas described.

ll.. Thecombinationof a-ratche-t; paWl-'carriages: pivotallyljconnected therewith:'ipaverls-ffv "movable-1n saldy carriages androl'lersin said' 7 carriages on which-'the carriagesfare adapted4 vto rest, 'with 'leversfhav-lng an eccentricrnovef `ment with reference to said rollerls substantially as specified. f

1n ltestimonywhereof have hereunto: "af-y fixed Lmy'signaturci-n the presence of twofwit= l nesses. NICK WEIIJERi ai Witnesses:

H. f C. fGARDINER; 

